[특허]Method and apparatus for determining true motion vectors for selected pixels

[미국특허] Method and apparatus for determining true motion vectors for selected pixels 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04N-007/12
출원번호	US-0446351 (1995-05-22)
우선권정보	KR-0005713 (1995-03-18)
발명자 / 주소	Lee Min-Sub (Seoul KRX)
출원인 / 주소	Daewoo Electronics Co., Ltd. (Seoul KRX 03)
인용정보	피인용 횟수 : 41 인용 특허 : 0

초록 ▼

An inventive apparatus determines true motion vectors between a current and its previous frames for feature points selected from the previous frame wherein a selected feature point is surrounded by its neighboring four feature points to form a previous rhombus having a set of four triangles based on the selected feature point. A motion vector displacement generator gives a predetermined N number of displacements to an initial motion vector for its corresponding feature points to thereby produce a subset of N candidate motion vectors and a motion prediction block provides a current rhombus corresponding to the previous rhombus by the initial motion vectors, wherein the current rhombus has N sets of four triangles due to the N candidate motion vectors. A true motion vector is selected from the subset of N candidate motion vectors, which entails a minimum error value between the predicted pixel values for each triangle set in the current rhombus and their respective corresponding current pixel values from the previous frame.

대표청구항 ▼

A method for determining true motion vectors between a current and a previous frames for feature points, each of the feature points being defined in terms of a position of a pixel located at a node of a rectangular grid mapped on the previous frame, the method comprising the steps of: (a) assigning each of the feature points as a subject feature point in sequence, wherein the subject feature point is surrounded by its neighboring four feature points, to thereby define a previous rhombus, the previous rhombus having a set of four triangle regions, each of the triangles being formed by connecting the subject feature point and its two neighboring feature points; (b) detecting a first set of initial motion vectors for the feature points between the current frame and the previous frame; (c) providing a predetermined N number of displacements to each of the initial motion vectors for its corresponding subject feature point to thereby produce a subset of N candidate motion vectors; (d) defining a current rhombus in the current frame corresponding to each previous rhombus through the use of the first set of initial motion vectors; (e) generating N sets of four triangles in each current rhombus based on the N candidate motion vectors; (f) deriving a predicted pixel from the previous frame for each pixel contained in each set of four triangles within each current rhombus to provide a predicted pixel value therefor; (g) producing a differential pixel value for said each pixel contained in each set of four triangles by subtracting the predicted pixel value from the pixel value of said each pixel; (h) calculating N error values for said N sets of triangles in each current rhombus by averaging the differential pixel values corresponding thereto; (i) comparing said N error values to select an error value which entails a minimum error; and (j) choosing a motion vector, which corresponds to the selected minimum error value, from each subset of N candidate motion vectors as a true motion vector.

이 특허를 인용한 특허 (41) 인용/피인용 타임라인 분석

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Burns Ronnie R., Methods and systems for super compression of prior known objects in video and film.
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Lin Chih-lung Bruce ; Lee Ming-Chieh ; Chen Wei-ge, Overlapped motion compensation for object coding.
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Matsushita, Yasuyuki; Kang, Sing Bing; Tang, Xiaoou; Shiratori, Takaaki, Video completion by motion field transfer.
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[미국특허] Method and apparatus for determining true motion vectors for selected pixels 원문보기